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Live trends in quantum computing research, updated daily from arXiv.
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ZX-DB: A Graph Database for Quantum Circuit Simplification and Rewriting via the ZX-Calculus
Valter Uotila, Cong Yu, Bo Zhao·Nov 17, 2025
Quantum computing is an emerging computational paradigm with the potential to outperform classical computers in solving a variety of problems. To achieve this, quantum programs are typically represented as quantum circuits, which must be optimized an...
A Global Spacetime Optimization Approach to the Real-Space Time-Dependent Schrödinger Equation
Enze Hou, Yuzhi Liu, Linxuan Zhang +3 more·Nov 17, 2025
The time-dependent Schrödinger equation (TDSE) in real space is fundamental to understanding the dynamics of many-electron quantum systems, with applications ranging from quantum chemistry to condensed matter physics and materials science. However, s...
Fast Quantum Many Body State Synthesis
Prashasti Tiwari, Dylan Lewis, Sougato Bose·Nov 17, 2025
Quantum Mechanical ground states of many-body systems can be important resources for various investigations: for quantum sensing, as the initial state for nonequilibrium quantum dynamics following quenches, and the simulation of quantum processes tha...
A note on Schmidt-number witnesses based on symmetric measurements
Xiao-Qian Mu, Hao-Fan Wang, Shao-Ming Fei·Nov 17, 2025
The Schmidt number is an important kind of characterization of quantum entanglement. Quantum states with higher Schmidt numbers demonstrate significant advantages in various quantum information processing tasks. By deriving a class of k-positive line...
Floquet Superheating
Yang Hou, Andrea Pizzi, Huike Jin +3 more·Nov 17, 2025
Periodically driven many-body systems generally heat towards a featureless 'infinite-temperature' state. As an alternative to uniform heating in a clean system, here we establish a Floquet superheating regime, where fast heating nucleates at ''hot sp...
Pulsation of quantum walk between two arbitrary graphs with weakly connected bridge
Taisuke Hosaka, Etsuo Segawa·Nov 17, 2025
We consider the Grover walk on a finite graph composed of two arbitrary simple graphs connected by one edge, referred to as a bridge. The parameter $ε>0$ assigned at the bridge represents the strength of connectivity: if $ε=0$, then the graph is comp...
Approximate Message Passing for Quantum State Tomography
Noah Siekierski, Kausthubh Chandramouli, Christian Kümmerle +2 more·Nov 17, 2025
Quantum state tomography (QST) is an indispensable tool for characterizing many-body quantum systems. However, due to the exponential scaling of the cost of the protocol with system size, many approaches have been developed for quantum states with sp...
Open-shell frozen natural orbital approach for quantum eigensolvers
Angela F. Harper, Xiaobing Liu, Scott N. Genin +1 more·Nov 17, 2025
We present an open-shell frozen natural orbital (FNO) approach, which utilizes the second-order Z-averaged perturbation theory (ZAPT2), to reduce the restricted opten-shell Hartree-Fock virtual space size with controllable accuracy. Our ZAPT2 frozen ...
$\mathcal{PT}$-like phase transitions from square roots of supersymmetric Hamiltonians
Jacob L. Barnett, Ramy El-Ganainy·Nov 16, 2025
We introduce a general framework for realizing $\mathcal{PT}$-like phase transitions in non-Hermitian systems without imposing explicit parity--time ($\mathcal{PT}$) symmetry. The approach is based on constructing a Hamiltonian as the square root of ...
When does numerical pulse optimization actually help? Error budgets,robustness tradeoffs, and calibration guidance for transmon single-qubit gates
Rylan Malarchick·Nov 16, 2025
Numerical optimal control (GRAPE) can in principle discover pulse shapes that suppress all coherent gate error to machine precision. But when does that capability actually matter? We present a systematic comparison of Gaussian, DRAG, and GRAPE pulses...
Sdim: A Qudit Stabilizer Simulator
Adeeb Kabir, Steven Nguyen, Sohan Ghosh +3 more·Nov 16, 2025
Quantum computers have steadily improved over the last decade, but developing fault-tolerant quantum computing (FTQC) techniques, required for useful, universal computation remains an ongoing effort. Key elements of FTQC such as error-correcting code...
An Error Correctable Implication Algebra for a System of Qubits
Morrison Turnansky·Nov 16, 2025
We present the Lukasiewicz logic as a viable system for an implication algebra on a system of qubits. Our results show that the three valued Lukasiewicz logic can be embedded in the stabilized space of an arbitrary quantum error correcting stabilizer...
Giant number-parity effect and scalable spin squeezing in Luttinger liquids
Filippo Caleca, Saverio Bocini, Fabio Mezzacapo +1 more·Nov 16, 2025
Finite-size quantum spin systems can be magnetized by the application of a symmetry-breaking field, but in general their symmetry is expected to be restored once the field is turned off adiabatically. Recently (F. Caleca et al., arXiv:2412.15493) we ...
The role of averages in CV-QKD over fast fading channels
Miguel Castillo-Celeita, Matteo Schiavon·Nov 16, 2025
This work presents a study of continuous-variable quantum key distribution (CV-QKD) protocols over fast-fading channels, typically found in free-space communication links. Two eavesdropping models are considered to evaluate their security under colle...
Moments of quantum channel ensembles
Matthew Duschenes, Diego García-Martín, Zoë Holmes +1 more·Nov 16, 2025
Moments of ensembles of unitaries play a central role in quantum information theory as they capture the statistical properties of dynamics of systems with some form of randomness. Indeed, concepts such as approximate $t$-designs arise when comparing ...
The role of interaction in matter wave optics with motional states
RuGway Wu, Maximilian Prüfer, Jörg Schmiedmayer·Nov 16, 2025
Matter-wave optics is often viewed as a linear analogue of photonics, where noninteracting particles are coherently split, diffracted, and recombined, and interference arises from single-particle coherence. In ultracold quantum gases, however, intera...
Dissipative Dynamics of Charged Graphene Quantum Batteries
Disha Verma, Indrajith VS, R. Sankaranarayanan·Nov 16, 2025
We investigate dissipative dynamics in a graphene-based quantum battery modeled as a four level spin valley system. The battery is charged via a Gaussian pulse and subsequently evolves under amplitude damping, dephasing, and both Markovian and non Ma...
Quantum Hyperdimensional Computing: a foundational paradigm for quantum neuromorphic architectures
Fabio Cumbo, Rui-Hao Li, Bryan Raubenolt +4 more·Nov 16, 2025
A significant challenge in quantum computing (QC) is developing learning models that truly align with quantum principles, as many current approaches are complex adaptations of classical frameworks. In this work, we introduce Quantum Hyperdimensional ...
Stability of intrinsic localized modes on the lattice with competing power nonlinearities
Georgy L. Alfimov, Pavel A. Korchagin, Dmitry E. Pelinovsky·Nov 16, 2025
We study the discrete nonlinear Schrodinger equation with competing powers (p,q) satisfying 2 <= p < q. The physically relevant cases are given by (p,q) = (2,3), (p,q) = (3,4), and (p,q) = (3,5). In the anticontinuum limit, all intrinsic localized mo...
QPU Micro-Kernels for Stencil Computation
Stefano Markidis, Luca Pennati, Marco Pasquale +2 more·Nov 16, 2025
We introduce QPU micro-kernels: shallow quantum circuits that perform a stencil node update and return a Monte Carlo estimate from repeated measurements. We show how to use them to solve Partial Differential Equations (PDEs) explicitly discretized on...